The Seashell radio is for listening only, while the green bullet Faber created allows both listening and speaking.
The difference between the Seashell radio and the green bullet Faber created is that the Seashell radio doesn't allow you to speak through it while the green bullet allows you to both listen and speak. The Seashell is a one-way communication device for listening only, whereas the green bullet is a two-way communication device.
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